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Discussion Starter · #1 ·
i have a check engine light on in my truck. the code is a p0141(bank 1 sensor 2 i believe). when i check the sensors with my diablosport intune, one o2 sensor varies between 2.8-3.3v and the other sensor stays at 4.99v and doesnt change at all. when i rev the engine up, the first sensor shows a voltage change, but the other one still stays at 4.99v. the diablosport shows that the engine is calling for them to be at 2.7v and that increases as the throttle is pushed down. how can i check to make sure its the o2 sensor and not a wiring problem before i spend $60 on one?
 

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I'm sure someone with more mechanical expertise will voice up but there is a replacement threshhold on o2's and if you have a fair number of miles on your truck they may be due for a change. Price wise I would check at RockAuto to get new ones as they are very good. Make sure you go with NGK|NTK as the Bocsh are prone to premature failures in Ma's vehicles. Good luck.
 

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Discussion Starter · #3 ·
i just bought this truck and the dealer replaced the exhaust from the y pipe back. i asked them about the code still coming up and they said that they replaced both o2 sensors and that the catalytic converter just needed to break in. i just checked my c codes and i got a 64 97 and after that was either AA 03 or RR 03 then 00 00. im not quite sure what these mean as i dont have a service manual for the truck yet. the cat looks really small for an engine this size.
 

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Discussion Starter · #4 ·
i found a list of the c codes on a different forum. it looks like the 64 code i get has smoething to do with the door lock, but it works fine for me. and the AA code is probably from me messing with the different tunes on the diablo sport intune. i still have the p0141 code though.

C-Codes

01 Airbag warning indicator output circuit shorted. Refer to the appropriate
diagnostic information.
02 Airbag warning indicator output circuit open. Refer to the appropriate
diagnostic information.
03 ABS indicator output circuit shorted. Refer to the appropriate diagnostic
information.
04 ABS indicator output circuit open. Refer to the appropriate diagnostic
information.
05 MIL indicator output circuit shorted. Refer to the appropriate diagnostic
information.
06 MIL indicator output circuit open. Refer to the appropriate diagnostic
information.
07 Wait to start indicator circuit shorted. Refer to the appropriate
diagnostic information.
08 Wait to start indicator circuit open. Refer to the appropriate diagnostic
information.
0B BTSI output circuit shorted or open. Refer to the appropriate diagnostic
information.
22 Headlamp switch input circuit shorted. Refer to the appropriate
diagnostic information.
23 Headlamp switch input circuit open. Refer to the appropriate diagnostic
information.
24 Turn hazard switch input circuit shorted. Refer to the appropriate
diagnostic information.
25 Turn hazard swiitch inpot circuit open. Refer to the appropriate
diagnostic information.
27 Courtesy/dome output circuit shorted or open. Refer to the appropriate
diagnostic information.
28 Glovebox/map lamp output circuit shorted or
open.
Refer to the appropriate diagnostic information.
29 Cargolamp output circuit shorted or open. Refer to the appropriate
diagnostic information.
40 Wiper switch input circuit shorted. Refer to the appropriate diagnostic
information.
41 Wiper switch input circuit open. Refer to the appropriate diagnostic
information.
42 Wash/beam input circuit shorted. Refer to the appropriate diagnostic
information.
60 Passenger door lock switch input circuit
shorted.
Refer to the appropriate diagnostic information.
61 Passenger door lock switch input circuit open. Refer to the appropriate
diagnostic information.
62 Passenger door lock switch input circuit stuck. Refer to the appropriate
diagnostic information.
63 Driver door lock switch input circuit shorted. Refer to the appropriate
diagnostic information.
64 Driver door lock switch input circuit open. Refer to the appropriate
diagnostic information.
65 Driver door lock switch input circuit stuck. Refer to the appropriate
diagnostic information.
66 All door lock output circuit shorted to ground
or voltage.
Refer to the appropriate diagnostic information.
67 All door unlock output circuit shorted to
ground or voltage.
Refer to the appropriate diagnostic information.
68 Driver door unlock output circuit shorted to
ground or voltage.
Refer to the appropriate diagnostic information.
6C Driver cylinder lock switch input circuit
shorted.
Refer to the appropriate diagnostic information.
6E Driver cylinder lock switch input circuit stuck. Refer to the appropriate
diagnostic information.
80 Incorrect odometer value found. Refer to the appropriate diagnostic
information.
81 Remote radio switch input circuit high. Refer to the appropriate
diagnostic information.
82 Remote radio switch stuck. Refer to the appropriate diagnostic
information.
A0 Internal module FLASH memory checksum
failure.
Refer to the appropriate diagnostic information.
A1 Internal module bootloader failure. Refer to the appropriate diagnostic
information.
A3 Battery voltage open. Refer to the appropriate diagnostic information.
A5 TCCM messages not received. Refer to the appropriate diagnostic
information.
A7 VIN checksum error. Refer to the appropriate diagnostic information.
A8 VIN previously stored. Refer to the appropriate diagnostic information.
A9 PCI bus internal failure. Refer to the appropriate diagnostic
information.
AA PCM messages not received. Refer to the appropriate diagnostic
information.
AB TCM messages not received. Refer to the appropriate diagnostic
information.
AC ABS messages not received. Refer to the appropriate diagnostic
information.
AD FCM messages not received. Refer to the appropriate diagnostic
information.
AE ACM messages not received. Refer to the appropriate diagnostic
information.
AF SKIM messages not received. Refer to the appropriate diagnostic
information.
B0 RKE fob batteries low. Refer to the appropriate diagnostic information.
B1 RKE module communication link. Refer to the appropriate diagnostic
information.
00 Done All Diagnostic Trouble Codes (DTC) have been
displayed.
 

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Try disconnecting the battery, go inside the vehicle and turn the key to the start position then off 3 x. Now reconnect your battery and see if that helps. What this does is, drain all voltage backup to the ecu and clear all existing problems that have cropped up during the vehicle ecu variable running info and forces it back to the firmware baseline. If something has gone out of wack enough that the ecu can not cope with you can have all sorts of codes and emmision problems that can happen. This clears it up and gives you a baseline to start from. Did this on my son,s Dakota that had failed an etest and all his emission reading improved dramaticlly with no other intervention. Try it and see if it helps your situation. Good luck.
 

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Discussion Starter · #7 ·
i did what you said and went for a drive and no more check engine light. i checked the heater in the o2 sensor and it was good, and it was getting 12v to the o2 sensor heater. i wonder if it was the diablosport intune that caused all this.
 

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Discussion Starter · #8 ·
i was wrong, the check engine light is still on. whats the difference between the upstream and downstream o2 sensors? it could be possible that the dealer that i bought the truck from replaced both of them with the same sensor.
 

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If I remember correctly they should be different and the plugs should also be different. If you just got the vehicle I would go back and say fix it or give me my money back. You should not have this kind of problem so soon after buying especially when they supposedly just did the exhaust. I've never heard of a cat breakin time. Also before you take it in take your diablo tune off it.
 

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Discussion Starter · #10 ·
i looked at the o2 sensors this morning before work and they are the exact same sensor, same part# and everything. i also have a p0138 which is high voltage on the downstream sensor. my diablo sport intune shows me this on the data logging too. so since they are the same sensor, i tried switching them around to see what happens to the reading i get. before switching, the front sensor was reading 3-3.3v on the datalogger and the rear was holding at 5v. the computer wants them to be right around 2.7v. after i switched them, i was getting a steady 5v on both sensors. this tells me that the rear sensor is the wrong sensor because they are both the same and neither works in the rear position, and that the rear sensor is not working anyways because it will not work in the front position. the dealer i bought it from offered to fix it, but its going to cost me $100 in gas to go there! but i guess thats better than buying the o2 sensor and finding out something else is wrong.
 

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To just post a quick answer-about the sensors. NO they are NOT the same ones-i have a 2003/2500, part numbers should be different, they do how ever look the same.23132NGK Down Stream $49.00 and 23135NGK UPstream$29.00 and both say left or right bank app on amazon, f/s.
 

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Rock Auto is $28 and change and $43.50 and yes the up and down stream are different. As I said earlier make sure to go with NGK\NTK as this is what Ma's vehicles like. PS take the Diablo tune off before going to the dealer or they will try to blame you.
 

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Discussion Starter · #13 ·
i brought the truck there yesterday and they replaced the rear o2 sesnor with the right one, they had put two front sensors in the truck when they did the exhaust. after they put in the right sensor, i was getting 14-15 mpg compared to the 10-11 i was getting before!
 
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